The global chain’s fast-casual expansion into the Bay Area is well under way, with mini-burgers coming to cities throughout the South Bay and East Bay.

When the planned build-out is done, there will be several Burgerims in San Jose, two in Walnut Creek, two in Santa Clara, two in Vallejo and one each in American Canyon, Antioch, Berkeley, Concord, Livermore, Newark, San Ramon and Vacaville. (Stockton and Salinas also will get multiple outlets.)

Here’s how the build-your-burger concept here works:

Each Burgerim patty is what the company calls a “sensibly sized” 3 ounces, and customers can select “uno, duo or trio” or a party box.